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The original item was published from 9/12/2017 11:34:35 AM to 12/2/2017 12:05:01 AM.

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Air Quality

Posted on: September 12, 2017

[ARCHIVED] Reduce Dust When Planting Winter Rye Grass



Reduce Dust When Planting Winter Rye Grass


(PHOENIX, AZ) — Maricopa County Air Quality Department (MCAQD) encourages commercial properties and residents to reduce dust this fall when switching to winter rye grass. The process, known as overseeding, impacts air pollution due to dust generated when scalping existing Bermuda grass. Each year, the department responds to questions and concerns from landscapers, golf course managers and residents doing their best to reduce the dust while working to maintain grass-filled landscapes.

The department offers the following tips to help prevent dust during the overseeding process:

  • Avoid scalping on windy days and on High Pollution Advisory (HPA) days
  • Don’t over dry the area prior to scalping
  • Apply water to moisten the area prior to scalping
  • Reduce the depth of scalping       
  • Keep dust collection screens and filters in good working order
  • Hand rake, when possible; learn about leaf blower restrictions: P-25 Ordinance  
  • Moisten material piles before loading into dumpsters
  • Reduce the area to be overseeded

Generally overseeding/scalping projects do not require a Dust Control Permit, however, the dust emissions generated during these projects are still regulated under MCAQD’s Rule 310 (permitted source) or Rule 300 (unpermitted source), which states that the emissions cannot exceed 20 percent opacity. Visible emissions cannot travel beyond the property line.      

The department relies on citizens to help improve air quality. Residents may report air quality violations or dust control issues by calling the department at 602-372-2703 or filing a report online at

Overseeding flyer available in English and Spanish: Please check with your local municipalities for possible additional restrictions.


About Maricopa County Air Quality Department 

The Maricopa County Air Quality Department is a regulatory agency whose goal is to ensure federal clean air standards are achieved and maintained for the residents and visitors of Maricopa County. The department is governed by the Maricopa County Board of Supervisors and follows air quality standards set forth by the federal Clean Air Act. 

The department offers air quality information and resources on its Clean Air Make More website. Visit to learn more.

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Download our Clean Air Make More app! It is free to download and use. Available on iTunes for iPhone and iPad and on Google Play for Android, the app gives you real-time Phoenix air quality information, pollution alerts, forecasts, restrictions, and the ability to report an air quality problem or polluter.

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